New Born immunity-MIL controversy

So baby will be here within the week. My DH's parents want to schedule a visit sometime within the next couple weeks (they live out of state). Based on our own schedules it will when baby is between 3-4 weeks old, otherwise they will have to wait until baby is 8-10 weeks old. I would prefer that they wait (for reasons I'm about to explain) until that 8-10 week mark. However, my DH is not happy with this and my mother in law will certainly NOT be happy about this. 

My mother in law. She's a walking factory for bacteria and viruses. She's contstantly sick, but also as a baseline she always has a horrible hacking cough because she was a long time smoker and suffers from chronic asthma and some other lung affiliated ailments. Always always coughing. And my in laws hygiene is not only subpar, but appallingly lacking. I can sit and watch my MIL hacking into her hands and not only does she not habitually wash her hands (doubtful that anyone in that house does after using the bathroom but that's another rant for another day) but she will go on to prep food, touch commonly used (by others) surfaces and things etc. Their living environment is horrible and really I believe reflects on their general maintenance and hygiene of themselves. On top of this, they live in the middle of nowhere where it's too much of an inconvienince for anyone in the family to go out of their way to get their flu vaccine, and just forget about the TDAP (yeah right, not in a million years) and essentially the entire family either has the flu right now or some other kind of cold/illness. That being the family that she lives nearby and sees and interacts with most often. The icing on the cake is that she literally posted on Facebook yesterday that she wasn't feeling well and when this woman is sick she's sick for a long time. Needless to say I do not want her here within the next our weeks around our newborn baby. I tried explaining to my husband that not only will the baby be more safe if they wait, but the grandparents will get more enjoyment out of baby if they wait until the later date. And! That's about the time baby gets their first vaccines. Added bonus. My husband is making me make the call and explain this to my in laws. My MIL will be furious. I don't want to deal with it. I shouldn't have to deal with it. They should respect that my desires for them to visit at a later date is based on the welfare of our child and that should not be something that has to be a compromise. 

I'm trying to advocate for the health and well being of my baby but I am also feeling like the "bad guy". I haven't had the conversation with my MIL but I'll update you on what a disaster is when I do... 

Please, help. Any and all advice welcome. 

 Picture of baby from today's biophysical profile-everything was perfect! (Taken because I am overdue)